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Abstract

In keyboard display terminal systems it is quite common to have facilities whereby the data displayed by a display terminal can be transferred to an associated printer to produce hard copy of the displayed data. The system described below provides a matrix of values which is sent from an associated host processor to the controller of the display system, and then is operative in the controller to recognize print requests from individual displays. According to that matrix, individual displays can have access to individual or classes of printers, giving versatility to the system.

Country

United States

Language

English (United States)

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Print Authorization Matrix

In keyboard display terminal systems it is quite common to have facilities
whereby the data displayed by a display terminal can be transferred to an
associated printer to produce hard copy of the displayed data. The system
described below provides a matrix of values which is sent from an associated
host processor to the controller of the display system, and then is operative in the
controller to recognize print requests from individual displays. According to that
matrix, individual displays can have access to individual or classes of printers,
giving versatility to the system.

The figure shows an information handling system of a kind which can utilize
this feature. A number of keyboard displays 10 and printers 14 are connected by
respective transmission lines 16 and an adapter 18 to the I/O bus 20 of a
controller 22 having storage facilities 24 for the above-described matrix.
Controller 22 is also connected to a host data processing system 26 which can
load the matrix into storage 24.

In this system, adapter 18 has a number of ports labelled 0
through N, each accommodating a single keyboard display 10 or a
single printer 14. Table I shows a typical port assignment wherein
the ports are labelled 0 through 8 and their utilization is indicated
by a "D" for a display or a "P" for a printer.

According to the matrix, the printers at ports 1, 2 and 5 are assigned for local
use (i.e., by a display of the system), the printer at port 6 is "shared" (i.e., can be
used by a display or by the host), and the printer at port 7 is reserved for use by
the system, (i.e., by host 26).

As indicated further by the matrix, the printers at position 1 and 2 are of class
71, while those at positions 5 and 6 are of class 72 and 7...